Land disturbance of one acre or more in Champaign County triggers Illinois EPA's ILR10 construction stormwater permit. Champaign, Urbana, and Savoy layer local detention and MS4 requirements on top.
Construction that disturbs one acre or more, or a smaller lot inside a larger common plan, needs coverage under Illinois EPA's ILR10 general NPDES permit before ground is broken, filed with a Stormwater Pollution Prevention Plan. Runoff off this flat, tile-drained county drains toward the Sangamon and Embarras headwaters and Boneyard Creek, so Champaign, Urbana, Savoy, and the University of Illinois enforce local stormwater and detention standards under their MS4 permits. Post-construction detention basins must be maintained by the property owner, and illicit discharges to the storm sewers are prohibited.
Disturbing an acre without ILR10 coverage draws Illinois EPA enforcement and stop-work orders. Illicit storm-drain discharges and failed detention basins bring local fines until corrected.
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Champaign County, IL
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See how Champaign County's stormwater management rules stack up against other locations.
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